GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2002 🢒 TrailBlazer - 2WD 🢒 Body and Accessories 🢒 Wiring Systems 🢒 Harness Routing Views
Figure 1:

Forward Lamp Harness, Fuse Block-Underhood
Object Number: 748823 Size: MF
(1)C105
(2)Forward Lamp Harness
(3)G101
(4)Brake Fluid Level Connector
(5)G105
(6)G102
Figure 2:

Forward Lamp Harness, Fuse Block-Underhood
Object Number: 748813 Size: MF
(1)G101
(2)Forward Lamp Harness
(3)Fuse Block-Underhood, C4
Figure 3:

Forward Lamp Harness, Front
Object Number: 748819 Size: MF
(1)Ambient Air Temperature Sensor Connector
(2)Forward Lamp Harness
(3)C118
Figure 4:

Forward Lamp Harness, Right Side
Object Number: 748820 Size: MF
(1)G103
(2)A/C Low Pressure Switch
(3)Winshield Washer Fluid Pump Connectors
(4)Windshield Washer Fluid Level Switch
(5)Forward Lamp Harness
Figure 5:

Engine Harness, Fuse Block-Underhood
Object Number: 748821 Size: MF
(1)C105, I/P to Forward Lamp Harness, Fuse Block-Underhood
(2)C4, Forward Lamp Harness, Fuse Block-Underhood
(3)C3, Chassis Harness, Fuse Block-Underhood
(4)C2, Instrument Panel Harness, Fuse Block-Underhood
(5)C101, I/P to Chassis Harness
(6)C1, Engine Harness, Fuse Block-Underhood
Figure 6:

Engine Harness, Fuse Block-Underhood
Object Number: 748824 Size: MF
(1)PCM
(2)C100, Engine Harness to I/P Harness
(3)C1, Fuse Block-Underhood
(4)PCM Connectors
(5)Engine Harness
Figure 7:

Engine Harness, Right Side
Object Number: 748825 Size: MF
(1)Engine Harness
(2)C104, Engine to Fuel Injection Harness
Figure 8:

Engine Harness, Right Front
Object Number: 748826 Size: MF
(1)Engine Harness
(2)Oil Pressure Sensor Connector
Figure 9:

Engine Harness, Automatic Transmission
Object Number: 748827 Size: MF
(1)Engine Harness
(2)Engine Harness
Figure 10:

Engine Harness, Transfer Case
Object Number: 799400 Size: MF
(1)Transfer Case Motor Encoder Connector
(2)C310, Engine to Chassis Harness
(3)Engine Harness
(4)Chassis Harness
Figure 11:

Connector C201
Object Number: 748385 Size: MF
(1)Multi-function Switch
(2)C201
Figure 12:

Front Passenger and Driver Seats
Object Number: 800582 Size: MF
(1)C312
(2)C313
(3)C311
(4)C315
(5)C316
(6)C314
Figure 13:

Chassis Harness, Underhood
Object Number: 748836 Size: MF
(1)Chassis Harness
(2)Chassis Harness
(3)Axle Switch Connector
Figure 14:

Chassis Harness, Frame-Left Side
Object Number: 748838 Size: MF
(1)Chassis Harness
(2)Electronic Brake Control Module (EBCM)
(3)G304
Figure 15:

Chassis Harness, Fuel Tank
Object Number: 748841 Size: MF
(1)Fuel Pump and Sender Assembly
(2)Canister Vent Solenoid Connector
(3)Fuel Tank Pressure (FTP) Sensor
(4)Chassis Harness
Figure 16:

Chassis Harness, Rear Crossmember
Object Number: 748848 Size: MF
(1)Air Suspension Sensor Connector
(2)Chassis Harness
Figure 17:

Chassis Harness, Frame Grounds
Object Number: 748851 Size: MF
(1)G304
(2)G305
(3)G403 (Short Wheelbase)
Figure 18:

Chassis Harness, Rear Frame
Object Number: 748853 Size: MF
(1)Chassis Harness
(2)Backup Lamp Socket
Figure 19:

Underhood Fuse Block
Object Number: 748854 Size: MF
(1)G104
(2)G105
(3)C105, Instrument to Forward Lamp Harness
(4)C101, Instrument to Chassis Harness
(5)G102
(6)Windshield Wiper Connector
Figure 20:

Instrument Harness, Engine Compartment
Object Number: 748860 Size: MF
(1)C104, Engine to Fuel Injector Harness
(2)C100, I/P to Engine Harness
(3)C105, I/P to Forward Lamp Harness
(4)Fuse Block Underhood, C2
(5)C101, Instrument to Chassis Harness
(6)PCM Connector, C1
Figure 21:

Instrument Harness, Left I/P
Object Number: 748862 Size: MF
(1)Headlamp Switch Connectors
(2)Splice Pack SP205
(3)Grommet
(4)Instrument Panel Harness
Figure 22:

Instrument Harness, Instrument Panel
Object Number: 748865 Size: MF
(1)Connector C203
(2)Accessory Power Connector
(3)Cigar Lighter Connector
(4)Rear Window Wiper/Washer Connector
(5)Headlamp Switch
Figure 23:

Instrument Harness, Console
Object Number: 748867 Size: MF
(1)C307, I/P to Console Harness
Figure 24:

Instrument Panel, Right Side
Object Number: 879165 Size: MF
(1)Instrument Panel
(2)Body Harness
(3)C203, Body Harness
(4)C203, I/P Harness
Figure 25:

Instrument Harness, Floor
Object Number: 748869 Size: MF
(1)SP201, Ground Splice Pack
(2)Instrument Panel Harness
(3)C307, I/P to Console Harness
(4)Sensing and Diagnostic Module Connector
(5)C304, I/P to Body Harness
(6)C301, I/P to Body Harness
Figure 26:

Instrument Harness, Rear Floor
Object Number: 748868 Size: MF
(1)Body Control Module (BCM) Connectors
(2)Fuse Block-Rear, I/P Connector, C1
(3)Fuse Block-Rear, Body Connector, C2
(4)Fuse Block-Rear, Headliner Connector, C3
(5)I/P Harness
(6)VCIM Connectors
(7)Splice Pack SP306
Figure 27:

Floor Console (Long Wheelbase, Body Type VIN 6)
Object Number: 855630 Size: MF
(1)Front Floor Panel
(2)Front Floor Console
(3)Body Harness
(4)C309
Figure 28:

Body Wiring Harness Extension Harness
Object Number: 841111 Size: MF
(1)Body Control Module (BCM)
(2)Body Wiring Harness Extension Harness
(3)Fuse Block-Rear
Figure 29:

Front Doors, C500 and C600
Object Number: 1232491 Size: MF
(1)Door, LF
(2)Body Wiring Harness
(3)C500, C600 similar on right side
Figure 30:

Body Harness, Rear Floor
Object Number: 748872 Size: MF
(1)Fuse Block-Rear, Body Connector, C2
(2)C304, Body to Instrument Harness (Short Wheelbase, Body Type VIN 3)
(3)C306 Body to Headliner Harness (Short Wheelbase, Body Type VIN 3)
(4)C301, Body to Instrument Harness (Short Wheelbase, Body Type VIN 3)
(5)Vehicle Communication Interface Module (VCIM) Connectors
Figure 31:

Body Harness, Rear Floor (Long Wheelbase, Body Type VIN 6)
Object Number: 849565 Size: MF
(1)C301
(2)C304
(3)Body Harness
(4)Rear Floor
(5)Instrument Panel Harness
Figure 32:

Body Harness, Left Rear Floor (Long Wheelbase, Body Type VIN 6)
Object Number: 849569 Size: MF
(1)Fuse Block-Rear
(2)Body Harness
(3)Headliner Harness
(4)C306
Figure 33:

Body Harness, C401 (Long Wheelbase, Body Type VIN 6)
Object Number: 872310 Size: MF
(1)Mode Actuator-Auxiliary
(2)Blower-Auxiliary
(3)Air Temperature Actuator-Auxiliary
(4)C401
(5)In-Line 30A Fuse
Figure 34:

Headliner Harness, Overhead Console
Object Number: 795316 Size: MF
(1)Overhead Console
(2)C305
Figure 35:

Headliner Harness, Left B-Pillar
Object Number: 748876 Size: MF
(1)Headliner Harness
(2)Door Frame
(3)G302
Figure 36:

Headliner Harness, Left Rear Floor
Object Number: 748877 Size: MF
(1)C306, Headliner Harness to Body Harness
(2)Fuse Block-Rear, Headliner Connector, C3
(3)Body Harness
(4)Headliner Harness
Figure 37:

Sunroof Harness With Headliner Removed
Object Number: 813455 Size: MF
(1)C308
(2)Sunroof Motor Connector
(3)Connector C1
(4)Sunroof Module
(5)Connector C2
Figure 38:

Rear Doors, C700 and C800
Object Number: 755998 Size: MF
(1)Door, LR
(2)C700, C800 similar on right side
(3)Body Wiring Harness
Figure 39:

G401, G402
Object Number: 826159 Size: MF
(1)Body Side Lower Reinforcement
(2)Body Harness
(3)G401; G402 Similar on Opposite Side
Figure 40:

Tailgate Connector
Object Number: 755995 Size: MF
(1)Liftgate
(2)C900
(3)Body Opening